化简:5(y-2)^2-3(y+1)(y-1);(3a+2b)(2b-3a)(9a^2-4b^2)
(3x-y)(3x+y)+y(x+y);(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)快点,
计算 1、(a-b)^3*(a-b)^4*(b-a)^3 2、y^(m+2)*y*y^(m-1)+y^(2m+2) 3、
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
1)已知4X=5y,求(X+y):y 2)已知(a-b):(a+b)=3:7,求a:b
分解公因式p(x-y)-q(y-x)(a+b)(a-b)-(b+a)10a(x-y)^2-5b(y-x)3p(m-2n)
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
几道因式分解..4ab(a+b)^2-6a^2b(a+b)(x+y)^2(x-y)+(x+y)(x-y)^22a(a-3
3x(a-b)-2y(b-a) 因式分解
①[(x+y)^2-(x+y)(x-y)]/2y②(-1/3a^3b^2)^2(-2ab^2)^3/(1/9a^4b^4
把(a+b)和(x+y)各看成一项,合并同类项:(1)4(a+b)+2(a+b)-(a+b); (2)3(x-y)^2-
同底数幂乘方(a-b)^5*(a-b)^10*(b-a)(a-2b)^2*(a-2b)*4*(a-b)(x-3y)^2*
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)